00324nam a2200109Ia 4500 211215s9999 xx 000 0 und d Jayakar Knowledge Resource Centre .United Nations . Sampale Serveys of curent intest ,4th report . .United Nations . New York. 1952 1 45252 45252 0 0 0 0 2 2 2 0000-00-00 2.37 0 B280Y1&1:N5 .4 57010 2021-12-31 0000-00-00 1